JP2768096B2 - Message signal management method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a NO. The present invention relates to a message signal management method in a common signal network that requires a PCR procedure as level 2 in order to use a 7-signal network, particularly a satellite line.

[0002]

2. Description of the Related Art NO. Level 2 in the 7-signal system has the basic procedure and PCR
There are two types of error control means of the procedure. Normally, the basic procedure is used for the error control method on the terrestrial line.
When a satellite line is used for communication with a remote island, a PCR procedure is used for the error control method because the delay of the transmission path is large.

Since the difference between the basic procedure and the PCR procedure is only error control at level 2, a conversion adapter from a terrestrial line to a satellite line or from a satellite line to a terrestrial line (that is, a basic procedure / PCR procedure conversion adapter) is used. It is configured such that the difference of level 2 should be absorbed.

[0004]

In the conventional message signal management system, the conversion adapter is NO. When it is necessary to switch the link due to the occurrence of a link failure or the like as the protocol No. 7, NO. It is impossible to sufficiently cover the original function of the 7-signal network, and there is a problem that a process of confirming a network management signal at level 3 is required.

[0005]

According to the message signal management method of the present invention, a P which indicates the priority of signal processing at level 3 or higher allocated in a level 2 processing field.
Level 3 with RI field and highest priority signal
In a network management signal to be processed, in particular, a COO (Change Over O
rder) Only functions relating to signal processing are provided with a function as level 3.

[0006]

According to the present invention, when the necessity of the link switching arises, the confirmation processing of the network management signal at the level 3 can be performed.

[0007]

FIG. 1 is a block diagram showing an embodiment of a message signal management system according to the present invention. As an example, a common line signal network having a double link configuration in consideration of load distribution is shown. In the figure, reference numerals 1A and 1B denote NO. And a second exchange for relaying the first and second signals.
The exchanges 2A and 2B respectively have a first basic procedure signaling link and a second basic procedure signaling link, 3A
And 3B are each a first basic procedure signal link 2
A and the second basic procedure signal link 2B,
NO. A first conversion adapter and a second conversion adapter for converting a level 2 error control procedure of the seven-signal system from a basic procedure to a PCR procedure.

The first conversion adapter 3A and the second conversion adapter 3B normally perform only level 2 termination, but have a function of processing only a specific level 3 signal when necessary. 4 is a communication link between the adapters for performing communication between the first conversion adapter 3A and the second conversion adapter 3B, 5A and 5B are a first backup line and a second backup line of a PCR procedure signal link, respectively, and 6 is a NO. It is a satellite that transmits and receives seven signals and relays them.

Reference numerals 7A and 7B denote first and second conversion adapters on the other end, respectively, and reference numeral 8 denotes a signal terminal exchange. FIG. It is a figure which shows the format of the signaling message used for 7 signaling systems.

Next, the operation of the message signal management system having the above configuration will be described. First, in the normal state, the signal link uses the first basic procedure signal link 2A and the second basic procedure signal link 2B for load sharing, does not use the first backup line 5A and the second backup line 5B, and uses the satellite 6 instead. The satellite line used.

When the first basic procedure signal link 2A, the second basic procedure signal link 2B, or the satellite line has a link failure due to the occurrence of an abnormality, it is necessary to switch the load of the failed link to one of the links. . For example, when the satellite link becomes abnormal, the first backup link 5A or the second backup link 5B
Need to switch to.

Since this link switching is performed by the level 3 signal, the first conversion adapter 3A and the second conversion adapter 3A
B checks whether the signal is a level 3 signal by checking the PRI (priority designation) field in the level 2 field, and closes the signal in level 3 which is the highest priority signal.
It is checked whether it is a network management signal to be processed, and if it is a network management signal, it is further checked whether it is a link switching instruction signal.

If the signal is a link switching instruction signal, the inter-adapter communication link 4 provided between the first conversion adapter 3A and the second conversion adapter 3B is used to notify the result of the retrieval performed by the conversion adapter on the link failure side. Then, link switching can be completed.

[0014]

As described above in detail, according to the message signal management system of the present invention, the conversion adapter normally performs only level 2 termination and processes only a specific signal among level 3 signals only when necessary. Has an effect that the conversion adapter can be economically and simply configured.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a message signal management system according to the present invention.

FIG. It is a figure which shows the format of the signaling message used for 7 signaling systems.

[Explanation of symbols]

 1A, 1B exchange 2A, 2B basic procedure signal link 3A, 3B conversion adapter 4 communication link between adapters 5A, 5B backup circuit 6 satellite 7A, 7B conversion adapter 8 signal terminal exchange

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-24847 (JP, A) JP-A-2-142295 (JP, A) JP 7-48777 (JP, B2) JP 8-8 8522 (JP, B2) Patent 2548156 (JP, B2) Patent 2555902 (JP, B2) CCITT RECOMMENDATION ION 703 (58) Field surveyed (Int. Cl. ⁶ , DB name) H04L 12/56 H04M 7/06

Claims (1)

(57) [Claims] 1. A NO. 1 compliant with the CCITT recommendation. No. 7 signal exchange, NO. Converting the 7-signal level 2 error control procedure from the basic procedure to the PCR procedure,
A conversion adapter that performs only level 2 termination; 7 and a satellite for transmitting and receiving the signals, a backup line thereof, In a common channel signal network composed of 7 signal end stations, the conversion adapter checks the level 3 field only when the priority designation in the message is a specific value, and processes only the highest priority network management signal; A message signal management method for coping with link switching due to a link failure.